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Questions and Answers
Particles and gases in the ______ can affect the incoming light and radiation.
atmosphere
Before radiation used for remote sensing reaches the Earth's surface, it travels through the Earth's ______.
atmosphere
The fact that the sky appears 'blue' during the day is because of ______ scattering.
Rayleigh
______ scattering occurs when particles are very small compared to the wavelength of the radiation.
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Scattering and ______ are the mechanisms that affect the incoming light and radiation.
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The ______ radiation is redirected from its original path when particles or large gas molecules interact with it.
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Mie scattering affects ______ wavelengths than those affected by Rayleigh scattering.
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Mie scattering occurs mostly in the ______ portions of the atmosphere where larger particles are more abundant.
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Non-selective scattering occurs when the particles are much ______ than the wavelength of the radiation.
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Carbon dioxide absorbs in the area associated with ______ heating.
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Water vapour serves to absorb the ______ ultraviolet radiation from the sun.
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Water vapour absorbs much of the incoming ______ wave infrared and shortwave microwave radiation.
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Those areas of the spectrum which are not severely influenced by ______ absorption and thus, are useful to remote sensors are called atmospheric windows.
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There are three forms of ______ that can take place when energy strikes, or is incident upon the surface.
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Radiation that is not absorbed or scattered in the ______ can reach and interact with the Earth's surface.
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In remote sensing, we are most interested in measuring the ______ reflected from targets.
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Transmission occurs when radiation passes through a ______.
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Reflection occurs when radiation 'bounces' off the ______ and is redirected.
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Study Notes
Interactions with the Atmosphere
- Particles and gases in the atmosphere can affect incoming light and radiation through mechanisms of scattering and absorption.
- Scattering occurs when particles or large gas molecules interact with and cause electromagnetic radiation to be redirected from its original path.
- Types of scattering include:
- Rayleigh scattering: occurs when particles are very small compared to the wavelength of the radiation, causing shorter wavelengths to be scattered more than longer wavelengths.
- Mie scattering: occurs when particles are larger, affecting longer wavelengths, and is common in the lower atmosphere.
- Non-selective scattering: occurs when particles are much larger than the wavelength of the radiation, scattering all wavelengths equally.
Absorption
- Absorption causes molecules in the atmosphere to absorb energy.
- Ozone, carbon dioxide, and water vapour are examples of molecules that absorb energy.
- Water vapour absorbs harmful ultraviolet radiation and long wave infrared and shortwave microwave radiation.
Atmospheric Windows
- Atmospheric windows are areas of the spectrum that are not severely influenced by atmospheric absorption and are useful for remote sensors.
- By comparing the characteristics of energy sources with atmospheric windows, we can define the wavelengths that can be used most effectively for remote sensing.
Radiation-Target Interactions
- Radiation that is not absorbed or scattered in the atmosphere can interact with the Earth's surface.
- Three forms of interactions can take place when energy strikes the surface: absorption, transmission, and reflection.
- Reflection is the most important interaction in remote sensing, as it measures the radiation reflected from targets.
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Description
Learn about the principles of Mie scattering and non-selective scattering, including their effects on different wavelengths of radiation and the role of particles in the atmosphere. Discover how these types of scattering occur in the lower atmosphere and the impact of larger particles like water droplets and dust.
